chf=bg,s,FFFFFF00
is a code for the old Google Image Charts.
Those codes will only work with the non-SVG versions of charts. Google Image Charts have been deprecated (as you can see from their help pages), so unless you want to implement the old-style charts, you won't be able to implement the above code on your new, fancy, interactive SVG charts.
For the new fancy SVG charts, I have luck with
backgroundColor: "transparent"
Copy-paste this in to Google Playground to test:
<!--
You are free to copy and use this sample in accordance with the terms of the
Apache license (http://www.apache.org/licenses/LICENSE-2.0.html)
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>
Google Visualization API Sample
</title>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load('visualization', '1', {packages: ['corechart']});
</script>
<script type="text/javascript">
function drawVisualization() {
// Create and populate the data table.
var data = google.visualization.arrayToDataTable([
['Year', 'Austria', 'Bulgaria', 'Denmark', 'Greece'],
['2003', 1336060, 400361, 1001582, 997974],
['2004', 1538156, 366849, 1119450, 941795],
['2005', 1576579, 440514, 993360, 930593],
['2006', 1600652, 434552, 1004163, 897127],
['2007', 1968113, 393032, 979198, 1080887],
['2008', 1901067, 517206, 916965, 1056036]
]);
// Create and draw the visualization.
new google.visualization.BarChart(document.getElementById('visualization')).
draw(data,
{title:"Yearly Coffee Consumption by Country",
width:600, height:400,
vAxis: {title: "Year"},
hAxis: {title: "Cups"},
backgroundColor: "transparent"}
);
}
google.setOnLoadCallback(drawVisualization);
</script>
</head>
<body style="font-family: Arial;border: 0 none;" bgcolor="#E6E6FA">
<div id="visualization" style="width: 600px; height: 400px;"></div>
</body>
</html>
This is just the standard bar chart example with two things added:
- bgcolor="#E6E6FA" to the body element (make it blue so we can tell if transparent)
- backgroundColor="transparent" to the options (make it transparent)
This works in FireFox. I don't know if it works in IE7 (no testing environment). Let us know if it works.
